S.1 Motion Study Questions


 



  • 1) When an object’s distance from another object is changing,




  • 2) As Earth orbits the sun, it is moving about




  • 3) A place or object used for comparison to determine if something is in motion is called




  • 4) Speed equals distance divided by




  • 5) When you know both the speed and direction of an object’s motion, you know the




  • 6) Average speed is




  • 7) If you know the distance an object has traveled in a certain amount of time, you can determine




  • 8) If the speed of an object does NOT change, the object is traveling at a




  • 9) If a bicyclist travels 30 kilometers in two hours, her average speed is




  • 10) If an object moves in the same direction and at a constant speed for 4 hours, which of the following is true?




  • 11) If you know a car traveled 300 kilometers in 3 hours, you can find its




  • 12) A car travels 85 km in the first hour of a trip. The car continues to travel for 2 more hours and travels 200 km. What was the average speed of the car for the trip?




  • 13) The rate at which velocity changes is called




  • 14) Which of these is an example of deceleration?




  • 15) It is rare for any motion to




  • 16) Changing direction is an example of a kind of




  • 17) The moon accelerates because it is




  • 18) A runner rounding a curve on a track at a constant speed is an example of what type of acceleration?




  • 19) To determine the acceleration rate of an object, you must calculate the change in speed during each unit of




  • 20) If speed is measured in kilometers per hour and time is measured in hours, the unit of acceleration is




  • 21) Which of the following is the correct equation for acceleration?




  • 22) In a graph showing speed versus time, a straight line shows the acceleration is




  • 23) What kind of line on a distance-versus-time graph indicates that the object is accelerating?




  • 24) The energy associated with motion is called




  • 25) Which of the following has kinetic energy?




  • 26) Unlike kinetic energy, potential energy is




  • 27) Potential energy that depends on height is called




  • 28) When you rub your hands together on a cold day, you use friction to convert




  • 29) In a graph of distance versus time, the slope represents




  • 30) The rise of a line on a distance-versus-time graph is 400 km and the run is 50 hours. What is the speed of the object represented by this graph?




  • 31) Motion is measured relative to a reference point.
  • 32) A meter is a place or object used for comparison to determine if something is in motion.
  • 33) If a toy car traveling at 10 cm/s passes a toy car moving at 10 cm/s in the opposite direction, both cars have the same velocity.
  • 34) A child riding on a merry-go-round is accelerating because his direction is changing
  • 35) The SI unit of velocity is the meter per second per second.
  • 36) A straight line on a graph of speed-versus-time means that the object has a constant acceleration
  • 37) The kinetic energy of a book on a shelf is equal to the work done to lift the book to the shelf.
  • 38) A compressed spring has elastic potential energy.
  • 39) A helicopter flies 100 km to the north and then flies 50 km to the east. The helicopter has traveled a total displacement of 150 km.
  • 40) Displacement is the length and direction that an object has moved from its starting point.
  • 41) You are riding in a car traveling at 80 km/h. A fly trapped in the car rests on your shoulder. Describe the speed of the fly using two different reference points.
    Answer:
  • 42) You are in a speedboat on a river moving in the same direction as the current. The speedometer on the boat shows that its speed is 20 km/h. However, a person on the shore measures the boat’s speed as 23 km/h. How is this possible?
    Answer:
  • 43) Explain how to find the average speed of a car that travels 300 kilometers in 6 hours. Then find the average speed.
    Answer:
  • 44) People living at Earth’s equator are traveling at a speed of about 1,670 km/h as Earth spins on its axis. Are these people being accelerated? Explain.
    Answer:
  • 45) Car A is traveling north at 30 m/s and car B is traveling south at 30 m/s. If both cars have a southward acceleration of 1 m/s2, compare their speeds after 1 second. Explain your comparison.
    Answer:
  • 46) A roller coaster is moving at 10 m/s at the top of a hill and 22 m/s at the bottom of the hill two seconds later. Explain how to find the average acceleration of the roller coaster, and then find the average acceleration.
    Answer:
  • 47) A 1-kg cart slams into a stationary 1-kg cart at 2 m/s. The carts stick together and move forward at a speed of 1 m/s. Determine whether kinetic energy was conserved in the collision. Use the law of conservation of energy to explain the collision.
    Answer:
  • 48) How high must you lift a 25-newton book for it to have the same increase in potential energy as a 20-newton book that was lifted 0.5 m?
    Answer: